package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {



    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private SetmealDishMapper  setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 新增套餐(包括套餐和套餐菜品)
     */
    @Transactional
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {

        //向套餐表插入一条数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.insert(setmeal);


        // useGeneratedKeys="true" keyProperty="id"用于设置主键返回,获取insert语句生成的主键值
        Long setmealId = setmeal.getId();
        //向套餐关联的菜品表插入n条数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });
            setmealDishMapper.insertBatch(setmealDishes);
        }

    }

    /**
     * 套餐分页查询
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }


    /**
     * 根据ids批量删除套餐
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        for(Long id : ids){
            //1.判断当前套餐是否在起售中
            Setmeal setmeal = setmealMapper.getById(id);
            if(setmeal.getStatus() == StatusConstant.ENABLE){
                //起售中的套餐不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }

        ids.forEach(setmealID  -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealID);
            //删除套餐菜品关系表中的菜品数据
            setmealDishMapper.deleteBySetmealId(setmealID);
        });


    }


    /**
     * 根据套餐id查询套餐信息及关联的菜品信息回显
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        //根据套餐id查询套餐数据
        Setmeal  setmeal = setmealMapper.getById(id);
        //根据套餐id查询套餐关联的菜品数据
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        //将数据封装到SetmealVO中并返回
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal,setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 根据套餐id修改套餐信息(套餐及关联的菜品)
     */
    @Override
    public void updateWithDish(SetmealDTO setmealDTO) {
        //1.根据套餐id修改套餐数据
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO,setmeal);
        setmealMapper.update(setmeal);


        //2.根据套餐id修改套餐关联的菜品数据(先删除原有的菜品数据,再重新添加新的菜品数据)
        setmealDishMapper.deleteBySetmealId(setmealDTO.getId());//删除菜品数据

        //向套餐关联的菜品表插入n条数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealDTO.getId());
            });
            //3、重新插入套餐和菜品的关联关系，操作setmeal_dish表，执行insert
            setmealDishMapper.insertBatch(setmealDishes);
        }


    }

    /**
     * 套餐起售、停售 套餐内如果有停售菜品，则套餐无法上架
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含停售菜品，无法启售"
        if (status == StatusConstant.ENABLE){
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if (dish.getStatus() == StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
            //select d.*  from dish d left join setmeal_dish sd on d.id = sd.dish_id where sd.setmeal_id = ?
        }
        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);

    }
    //-------------------------------------------微信小程序端
    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }


}
